A study compared three display panels used by air traffic controllers. Each disp
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Question
A study compared three display panels used by air traffic controllers. Each display panel was tested for four different simulated emergency conditions. Twenty-four highly trained air traffic controllers were used in the study. Two controllers were randomly assigned to each display panel-emergency condition combination. The time (in seconds) required to stabilize the emergency condition was recorded. The following table gives the resulting data and the MINITAB output of a two-way ANOVA of the data.
Figure 12.12
(a) Interpret the interaction plot in the above table. Then test for interaction with = .05.
(b) Test the significance of display panel effects with = .05.
F = 18.54, p-value = .0000; (Click to select)rejectdo not reject H0
(c) Test the significance of emergency condition effects with = .05.
F = 75.53, p-value = .0000; (Click to select)do not rejectreject H0
(d) Make pairwise comparisons of display panels A, B , and C by using Tukey simultaneous 95 percent confidence intervals. (Round your answers to 2 decimal places. Negative amounts should be indicated by a minus sign.)
(e) Make pairwise comparisons of emergency conditions 1, 2, 3, and 4 by using Tukey simultaneous 95 percent confidence intervals. (Round your answers to 2 decimal places. Negative amounts should be indicated by a minus sign.)
(f) Which display panel minimizes the time required to stabilize an emergency condition? Does your answer depend on the emergency condition? Why?
(g) Calculate a 95 percent (individual) confidence interval for the mean time required to stabilize emergency condition 4 using display panel B. (Round your answers to 2 decimal places.)
Confidence interval [ , ]
Emergency Condition Display Panel 1 2 3 4 A 20 27 35 13 20 26 34 13 B 17 22 30 11 10 18 30 7 C 21 29 34 8 25 28 39 14 35 30 25 20 15 10 Panel A Panel B Panel CExplanation / Answer
A) Interpret the interaction plot in the above table. Then test for interaction with alpha =0.05
F(int)= .38, p-value= .879; cannot reject H0, no interaction exists.
B)Test the significance of display panel effects with = .05.
F = 18.54, p-value = .0000;
Reject Ho. Since P-value < 0.05
C) Test the significance of emergency condition effects with = .05.
F = 75.53, p-value = .0000;
Reject H0.Since p-value <0.05
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